CN109107696B - Symmetrical combined spiral ore grinding barrel and design method thereof - Google Patents
Symmetrical combined spiral ore grinding barrel and design method thereof Download PDFInfo
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- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
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Abstract
The invention relates to a symmetrical combined spiral ore grinding barrel and a design method thereof, and the symmetrical combined spiral ore grinding barrel comprises a barrel body, a feeding throat, a discharging throat and a transmission gear, wherein the feeding throat, the discharging throat and the transmission gear are respectively communicated with the end part of the barrel body; the eccentric cylinder comprises an inner cylindrical surface and an outer cylindrical surface, and an eccentric distance exists between the axis of the inner cylindrical surface and the axis of the outer cylindrical surface. The invention can obtain higher relative speed and larger grinding force between the materials and the grinding media in the ore grinding process, and has higher ore grinding efficiency; meanwhile, due to the adoption of a sectional type combined structure, the difficulty of production, manufacture, transportation, disassembly and assembly and maintenance of the large-scale combined ore grinding cylinder can be reduced.
Description
Technical Field
The invention relates to the technical field of mining machinery and equipment, in particular to a symmetrical combined type spiral ore grinding cylinder and a design method thereof.
Background
The ball mill is widely used in metal and nonmetal ore dressing, cement plant, power plant, ceramics and other industries, and is an important device for grinding mine ores. The ball mill has the working principle that when the cylinder body rotates around a horizontal axis at a specified rotating speed, materials and grinding media in the cylinder rise to a certain height along with a lining plate of the cylinder under the action of centrifugal force and friction force and then are separated from the lining plate. The materials are crushed by the impact force and the friction force generated by the grinding medium in the free falling or throwing process and the relative motion among the grinding media, the materials and the grinding media, so that the materials are extruded, collided, peeled and ground. The higher the relative speed between the material and the grinding medium in the ball mill cylinder, the higher and more sufficient the material is stripped, and the better the grinding effect. At present, most of common ball mill cylinders adopt cylindrical cylinders with single axis, uniform cross-section shapes and same-cavity structures, and the rotation axis of the cylinder coincides with the geometric axis of the cylinder. The mill barrel of this structure has a large part of "dead space" inside the grinding zone during grinding, i.e. a so-called zone where the relative velocity between the materials is small and even zero, and the materials in this zone are difficult to grind. The larger the "dead zone" area, the lower the mill grind.
The patents related to this technology are mainly: a ball mill cylinder, a ball mill with the cylinder and a manufacturing method (ZL 201510607347.7) disclose a single-axis regular hexagonal, regular octagonal or regular dodecagonal cylinder and a grinding bin structure. The cylinder body with the structure rotates for a circle relative to the cylindrical cylinder body, the speed change of materials in the cylinder body along the circumferential direction is large, but the speed and the direction of grinding media and the speed of the materials at the same angle position are the same in different cross sections along the axial direction; and the area of the dead zone existing in the cavity of the regular polygon structure is still large. Therefore, it is difficult to significantly improve the grinding efficiency using such a regular polygonal shaped cavity type structure.
A ball mill (ZL 201510022261.8) with a non-cylindrical inner cavity wall discloses a ball mill with a sectional type combined cylinder structure consisting of a circular section and an elliptical section. A section of cylinder with a circular section and diameter variable along the axis direction is arranged in the middle of the cylinder of the mill; more than two cylinder sections with elliptic cross sections and mutually perpendicular long axes are respectively arranged at the two ends of the rubber barrel, and rubber is lined on the inner wall of each cylinder section. Compared with the traditional single-axis cylindrical barrel, the material and the grinding medium can obtain larger peripheral speed difference in the rotating process of the multi-section combined type structure grinding machine barrel, and the material and the grinding medium on the interface of each barrel end can also obtain different speed differences, so that the material can be subjected to stronger extrusion and grinding effects. However, because the diameter of the mill cylinder is limited, the sizes of the long axis and the short axis of each section of the elliptical cylinder are close, and the speed difference between materials and grinding media is also limited, the ore grinding efficiency is difficult to be obviously improved by the sectional type and non-circular section combined cylinder structure.
An eccentric stirring ball mill (ZL 201510194133.1) discloses a geometric central line and a rotary central line of a mill cylinder body have an eccentric structure, and the rotary axis of the cylinder body is coaxial with the axis of a main shaft. In the process of grinding ore, materials and grinding media revolve around the main shaft along with the cylinder, and compared with a traditional single cylindrical cylinder grinder, the grinder with the eccentric structure can greatly reduce the dead zone area in the cylinder. In addition, because install a plurality of agitators on the main shaft, can stir the material in the section of thick bamboo and grind the medium, therefore can show improvement ore grinding effect. But the service life of the supporting bearing is influenced by the centrifugal load generated by the eccentric structure cylinder body in the rotation process, and the structure is more suitable for a small-sized mill; the stirrer on the main shaft can reduce the filling rate of the cylinder body and influence the efficiency of the mill; in addition, the replacement and maintenance of the stirrer are difficult.
Based on the consideration, the invention designs the symmetrical combined spiral ore grinding cylinder and the design method thereof, and the novel ore grinding machine has the advantages of simple structure, stable performance, convenient maintenance and use and the like of the traditional ore grinding machine and can obviously improve the ore grinding efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a symmetrical combined spiral ore grinding cylinder and a design method thereof.
In order to realize the purpose of the invention, the invention adopts the technical scheme that:
the invention discloses a symmetrical combined spiral ore grinding barrel which comprises a barrel body, a feeding throat, a discharging throat and a transmission gear, wherein the feeding throat, the discharging throat and the transmission gear are respectively communicated with the end part of the barrel body; the eccentric cylinder comprises an inner cylindrical surface and an outer cylindrical surface, and an eccentric distance exists between the axis of the inner cylindrical surface and the axis of the outer cylindrical surface.
The cross sections of the outer cylindrical surfaces of the eccentric cylinders are circles with equal radiuses, and the axes of the outer cylindrical surfaces are rotation axes; the axes of the inner cylindrical surfaces of the eccentric cylinders are axisymmetrically distributed around the rotating shaft to form a space spiral axis.
The cross section of the inner cylindrical surface is in an elliptical structure, an elliptical polygonal structure or an arc-straight line segment elliptical polygonal structure.
And a certain included angle is formed between long axes of the cross sections of the inner cylindrical surfaces of the adjacent eccentric cylinders.
The number of the eccentric cylinders is n, the eccentric cylinders sequentially deflect the included angles between the long shafts of the cross sections of the inner cylindrical surfaces of the eccentric cylinders in the same direction by 360/n degrees from left to right.
The eccentric cylinders are sequentially arranged from left to right, and the left end of the leftmost eccentric cylinder and the right end of the rightmost eccentric cylinder are respectively connected with the right end of the feeding throat pipe and the left end of the discharging throat pipe through flanges.
A method for designing a symmetrical combined spiral ore grinding cylinder comprises the following steps:
firstly, measuring the structural size, the working revolution, the feeding grade distribution, the grinding medium proportion, the filling rate and the ore grinding threshold speed value of a cylinder body, and calibrating the recovery coefficient, the dynamic friction coefficient and the static friction coefficient among a grinding medium-lining plate, a grinding medium-grinding medium, a material-lining plate, a material-grinding medium and a material-material;
secondly, simulating the ore grinding process of the cylinder by using a method of combining MATLAB, ADAMS and EDEM;
and thirdly, measuring the optimal eccentricity between the axis of the inner cylindrical surface and the axis of the outer cylindrical surface of the eccentric cylinder, the optimal cross section shape of the inner cylindrical surface of the eccentric cylinder, the number of the eccentric cylinders and the optimal spiral axis formed by the axes of the eccentric cylinders along the direction of the rotation axis.
Further comprising a verification step: designing a symmetrical combined spiral ore grinding cylinder and a traditional ball mill structural cylinder respectively, and carrying out ore grinding process simulation analysis and experimental analysis respectively by adopting the same technological parameters and working parameters; the rationality of the invention is verified by comparing the relative speed, the tangential friction force and the normal extrusion force between the materials and the grinding media inside the cylinder body and the statistical results of the number of the materials and the grinding media in the low-speed state inside the cylinder body.
The invention has the beneficial effects that:
1. according to the eccentric cylinder, the cross section of the inner cylindrical surface of the eccentric cylinder is irregular in shape within a circle range, so that the motion states and the velocity vectors of materials and grinding media passing through a lifting area, a discharging area and a throwing area in sequence are more diversified, and a larger velocity difference is obtained; meanwhile, as the radius within a circle range changes, the radial force of the material and the grinding medium can also change periodically, and the disturbance to the material and the grinding medium is strengthened, so that the ore grinding efficiency is improved;
2. according to the invention, a certain eccentric distance exists between the axis of the inner cylindrical surface of the eccentric cylinder and the axis of the combined cylinder body, so that each eccentric cylinder drives the materials and the grinding media to revolve around the revolving axis, the reduction of the dead zone area (namely the quantity of the materials and the grinding media in a low-speed state) in the cylinder on one hand is in direct proportion to the eccentric distance, and the materials in the cylinder on the other hand can be extruded by larger positive pressure along the radial direction, thereby enhancing the grinding effect;
3. according to the invention, the eccentric distance exists between the axes of the inner cylindrical surfaces of the adjacent eccentric cylinders, and the long axis of the cross section of each inner cylindrical surface has an angle difference along the circumferential direction, so that different velocity vectors appear on the materials and the grinding media near the interface of the adjacent eccentric cylinders, and the grinding effect of the grinding media near the interface on the materials can be greatly improved;
4. according to the invention, through the sequential equidirectional deflection of the cross section long axes of the inner cylindrical surfaces of the adjacent eccentric cylinders at the same included angle, if the deflection direction of the cross section long axes of the inner cylindrical surfaces of the adjacent eccentric cylinders is reasonably matched with the rotation direction of the combined cylinder body, the moving speed of the material along the axial direction can be accelerated, so that the over-grinding proportion of the material can be greatly reduced;
5. the invention adopts n sections of eccentric cylinders, and the axes of the inner cylindrical surfaces of the n sections of eccentric cylinders are uniformly arranged at equal angular intervals along the circumferential direction, so that the combined special-shaped cylinder body is of an axisymmetric structure relative to the rotary axis, and the formed combined special-shaped ore grinding cylinder body can realize static balance and cannot generate dynamic unbalance in the rotating process due to the eccentric cylinder body structure, and the service life of the supporting bearing of the combined cylinder body is not influenced.
Drawings
FIG. 1 is a schematic structural diagram of a symmetrical combined spiral ore grinding cylinder;
FIG. 2 is a schematic view of a feed throat flange configuration;
FIG. 3 is a cross-sectional view of an inner cylindrical surface of the eccentric cylinder;
FIG. 4(a) is a schematic view of a combination structure of inner cylindrical surfaces of a plurality of eccentric cylinders;
FIG. 4(b) is a schematic view of the structure of FIG. 4(a) from another perspective;
FIG. 5 is an analysis diagram of the material velocity in the lifting zone inside the eccentric cylinder;
FIG. 6 is a graph of eccentricity-kinetic energy increasing rate of the material and the grinding media in the eccentric cylinder;
FIG. 7 is a time-relative velocity curve of the material and the grinding media under different eccentricity conditions of the eccentric cylinder;
FIG. 8(a) is a time-tangential friction profile of the material in the eccentric cylinder;
FIG. 8(b) is a time-normal extrusion force profile of the material in the eccentric cylinder;
FIG. 9 is a graph of time versus material and media quantity at low speed;
FIG. 10(a) is a time-relative velocity curve of the material and the grinding medium in the axial direction when the number of the eccentric cylinders is 2 and the deflection included angle of the adjacent axes is 180 degrees;
FIG. 10(b) is a time-relative velocity curve of the material and the grinding medium in the axial direction when the number of the eccentric cylinders is 3 and the deflection included angle of the adjacent axes is 120 degrees;
FIG. 10(c) is a time-relative velocity curve of the material and the grinding medium in the axial direction when the number of the eccentric cylinders is 4 and the deflection included angle of the adjacent axes is 90 °;
FIG. 10(d) is a time-relative velocity curve of the material and the grinding media in the axial direction when the number of the eccentric cylinders is 6 and the deflection included angle of the adjacent axes is 60 degrees;
FIG. 10(e) is a graph of time versus relative velocity of material and grinding media in the axial direction for a conventional mill barrel configuration.
In the figure, a feeding throat pipe is 1, a rack left support is 2, a barrel body is 3, an eccentric barrel is 31, an inner cylindrical surface is 32, an outer cylindrical surface is 33, a transmission gear is 4, a rack right support is 5, a discharging throat pipe is 6, a rotary axis is 7, a space spiral axis is 8, and connecting holes are 11.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
see fig. 1-10.
The invention discloses a symmetrical combined spiral ore grinding barrel, which comprises a barrel body 3, a feeding throat pipe 1, a discharging throat pipe 6 and a transmission gear 4, wherein the feeding throat pipe 1, the discharging throat pipe 6 and the transmission gear 4 are respectively communicated with the end part of the barrel body 3; the eccentric cylinder 31 comprises an inner cylindrical surface 32 and an outer cylindrical surface 33, an eccentric distance exists between the axis of the inner cylindrical surface 32 and the axis of the outer cylindrical surface 33, each eccentric cylinder drives the materials and the grinding media to revolve around the revolving axis through the existence of the eccentric distance, and the reduction of the dead zone area in the cylinder, namely the quantity of the materials and the grinding media in a low-speed state is in direct proportion to the eccentric distance, so that the grinding effect can be enhanced; in an EDEM environment, respectively counting the quantity of materials and grinding media in a low-speed state in a traditional ball mill structural cylinder body and a single eccentric cylinder 31 in an ore grinding process, and taking the counted quantity as the area of a dead zone in the single eccentric cylinder 31, wherein a curve of the time-the quantity of the materials and the grinding media in the low-speed state in the traditional ball mill structural cylinder body and the single eccentric cylinder 31 is shown in a graph 8, so that the curve of the quantity of the materials and the grinding media with the speed lower than 0.3m/s in the traditional ball mill structural cylinder body is completely above the curve of the quantity of the materials and the grinding media with the speed lower than 0.3m/s in the single eccentric cylinder body in effective ore grinding time; in the ore grinding time of 2s-4s, the number of the materials and the grinding media with the speed lower than 0.3m/s in the cylinder body of the traditional ball mill structure is 140-170, while the number of the materials and the grinding media with the speed lower than 0.3m/s in the single eccentric cylinder body is 115-130; in the ore grinding time of 6s-8s, the quantity of materials and grinding media with the speed lower than 0.3m/s in the cylinder body of the traditional ball mill structure is 240, while the quantity of the materials and grinding media with the speed lower than 0.3m/s in the single eccentric cylinder body is basically stabilized at 170; therefore, the area of the dead zone in the eccentric cylinder 31 is obviously smaller than that in the cylinder of the traditional ball mill structure, thereby improving the ore grinding efficiency;
preferably, when the eccentricity between the axis of the inner cylindrical surface 32 and the axis of the outer cylindrical surface 33 is 1.5-2 times of the grain diameter of the material, the ore grinding efficiency is optimal; as shown in fig. 7, by changing the magnitude of the eccentricity of the single eccentric cylinder 31, time-relative velocity curves under different eccentricities are obtained; after the cylinder body 3 rotates for 2s, when the eccentricity is 20mm, the relative speed between the internal material of the eccentric cylinder and the grinding medium is more than 1 m/s; compared with the traditional mill, the relative speed between the materials in the combined cylinder and the milling media is improved by 8-20%; when the eccentricity is increased to 30mm, the relative speed between the materials in the eccentric cylinder 31 and the grinding media reaches 1-1.2 m/s; however, when the eccentricity is 40mm, the relative speed between the material and the grinding medium in the single eccentric cylinder 31 is reduced with respect to the relative speed when the eccentricity is 30mm, but still higher than the relative speed in the cylinder of the traditional ball mill structure; when the eccentricity is 50mm, the relative speed between the material and the grinding medium in the single eccentric cylinder 31 is reduced; the reason for this is that when the eccentricity of the single eccentric cylinder 31 is increased, the single eccentric cylinder 31 revolves around the rotation axis 7 of the cylinder 3 due to the eccentricity between the axis of the inner cylindrical surface of the single eccentric cylinder 31 and the rotation axis of the combined cylinder, the speed and centrifugal force of the materials and the materials inside the single eccentric cylinder are increased, and the friction force between the materials and the grinding media is increased; however, when the eccentricity is continuously increased, the effective space in the single eccentric cylinder 31 is reduced, so that the materials in the cylinder are accumulated, and the relative speed in the whole cylinder is reduced; therefore, there is an optimum value for the eccentricity of the single eccentric cylinder 31, i.e. the eccentricity of the single eccentric cylinder 31 is 1.5-2 times the particle size of the material. The grain size of the material adopted in the embodiment is 20mm, and analysis shows that the ore grinding efficiency is optimal when the eccentricity of a single eccentric cylinder is 30-40 mm;
through the eccentric distance between the axis of the inner cylindrical surface 32 and the axis of the outer cylindrical surface 33, the materials in the cylinder can be extruded under larger positive pressure along the radial direction, so that the grinding effect can be enhanced, for example, fig. 8(a) is a time-tangential friction force distribution curve of the materials in a single eccentric cylinder 31, and it can be found from the graph that when the ore grinding time reaches 2s, the tangential friction force change range between the materials in the cylinder body of the traditional ball mill structure and the grinding medium is 0.125N-0.15N, and the average value is 0.13N; the variation range of the tangential friction force between the material and the grinding medium in the eccentric single eccentric cylinder is 0.14N-0.18N, and the average value of the tangential friction force is 0.16N, so that the tangential friction force between the material and the grinding medium in the single eccentric cylinder 31 is larger than that between the material and the grinding medium in the traditional ball mill cylinder, and a better tangential ore grinding effect can be obtained; FIG. 8(b) is a time-normal extrusion force distribution curve of the material in the single eccentric cylinder, from which it can be found that, when the ore grinding time reaches 2s, the normal extrusion force between the material and the grinding medium in the cylinder of the conventional ball mill structure is 0.4N-0.6N, and the average value thereof is 0.5N; and the normal extrusion force between the material and the grinding medium in the eccentric single eccentric cylinder 31 is 0.5N-0.7N, and the average value is 0.6N, so that the normal extrusion force between the material and the grinding medium in the single eccentric cylinder 31 is higher than the normal extrusion force between the material and the grinding medium in the cylinder of the traditional ball mill structure, and a better normal ore grinding effect can be obtained.
The cross section of the outer cylindrical surface 33 of the eccentric cylinders 31 is a circle with equal radius, and the axis of the outer cylindrical surface 33 is a revolution axis 7; the axes of the inner cylindrical surfaces 32 of the eccentric cylinders 31 are axisymmetrically distributed about the revolution axis 7 to form a spatial spiral axis 8,
as shown in fig. 3(a), the cross section of the inner cylindrical surface 32 has an elliptical structure; the cross section of the inner cylindrical surface 32 is an elliptical polygonal structure as shown in fig. 3 (b); as shown in fig. 3(c), the cross section of the inner cylindrical surface 32 has an arc-straight line segment elliptical polygon structure, so that the motion states and velocity vectors of the material and the grinding media passing through the lifting area, the discharging area and the throwing area in sequence are more diversified, and a larger velocity difference is obtained; meanwhile, the radius within a circle range changes, so that the radial force of the material and the grinding medium can be changed periodically, the disturbance to the material and the grinding medium is strengthened, and the ore grinding efficiency is improved.
A certain included angle is formed between the long shafts 34 of the cross sections of the inner cylindrical surfaces of the adjacent eccentric cylinders 31, the deflection directions of the long shafts of the cross sections of the inner cylindrical surfaces of the adjacent eccentric cylinders are reasonably matched with the rotation direction of the combined cylinder body, the moving speed of the materials along the axial direction can be accelerated, and the over-grinding proportion of the materials can be greatly reduced.
The number of the eccentric cylinders 3 is n, the eccentric cylinders 3 sequentially deflect the included angles between the long shafts 34 of the cross sections of the inner cylindrical surfaces of the eccentric cylinders 3 in the same direction by 360/n degrees from left to right, and preferably, when the number of the single eccentric cylinders 31 is 4 and the included angles between the long shafts 34 of the cross sections of the inner cylindrical surfaces are sequentially deflected in the same direction by 90 degrees, the grinding efficiency of the cylinder 3 is highest; for example, fig. 10(a) is a time-relative velocity curve of the material and the grinding medium at the interface of the adjacent single eccentric cylinders in the axial direction when the number of the single eccentric cylinders is 2 and the deflection angle of the adjacent axial lines is 180 °. From the figure, it can be found that after the ore grinding time reaches 2s, two speed curves representing the materials and the grinding media at the interface of the adjacent single eccentric cylinder bodies are both 1m/s-1.2m/s, and the two speed curves are not overlapped in the stable ore grinding time; the speed difference between the materials at the two sides of the interface and the grinding media reaches 0.05 m/s-0.1 m/s;
fig. 10(b) is a time-relative velocity curve of the material and the grinding medium at the interface of the adjacent single eccentric cylinders in the axial direction when the number of the single eccentric cylinders 31 is 3 and the deflection angle of the adjacent axial lines is 120 °. From the figure, after the ore grinding time reaches 2s, two speed curves representing the materials and the grinding media at the interface of the adjacent single eccentric cylinder bodies are both 1m/s-1.22m/s, and the two speed curves are not overlapped in the stable ore grinding time; the speed difference between the materials at the two sides of the interface and the grinding media reaches 0.05-0.12 m/s;
fig. 10(c) is a time-relative velocity curve of the material and the grinding medium in the axial direction at the interface of the adjacent single eccentric cylinders when the number of the single eccentric cylinders 31 is 4 and the deflection angle of the adjacent axial lines is 90 °. From the figure, after the ore grinding time reaches 2s, two speed curves representing the materials and the grinding media at the interface of the adjacent single eccentric cylinder bodies are both 1m/s-1.22m/s, and the two speed curves are not overlapped in the stable ore grinding time; the speed difference between the materials at the two sides of the interface and the grinding media reaches 0.05-0.15 m/s;
fig. 10(d) is a time-relative velocity curve of the material and the grinding medium at the interface of the adjacent single eccentric cylinders in the axial direction when the number of the single eccentric cylinders 31 is 6 and the deflection angle of the adjacent axial lines is 60 degrees. From the figure, it can be found that after the ore grinding time reaches 2s, two speed curves representing the materials and the grinding media at the interface of the adjacent single eccentric cylinder bodies are both 1m/s-1.2m/s, and the two speed curves are not overlapped in the stable ore grinding time; the speed difference between the materials at the two sides of the interface and the grinding media reaches 0.05 m/s-0.1 m/s.
Fig. 10(e) is a time-relative velocity curve of the material and the grinding media at both sides of the middle section in the barrel body of the conventional structure in the axial direction, from which it can be found that after the ore grinding time reaches 2s, both velocity curves of the material and the grinding media in the barrel body are 1m/s, and that in the stable ore grinding time, the two velocity curves at both sides of the middle section are completely overlapped, and there is no velocity difference between the grinding media and the material; by analyzing and comparing fig. 10(a), 10(b), 10(c), 10(d) and 10(e), it can be found that by changing the number of single eccentric cylinders and the arrangement along the axis, the time-relative velocity curve of the material and the grinding medium in the direction of the axis is obtained. Through comparative analysis, the number of the single eccentric cylinders and the arrangement of the single eccentric cylinders along the axis have an optimal combination mode.
The eccentric cylinders 3 are sequentially arranged from left to right, the left end of the eccentric cylinder 3 at the leftmost side and the right end of the eccentric cylinder 3 at the rightmost side are respectively connected with the right end of the feeding throat pipe 1 and the left end of the discharging throat pipe 6 through flanges, and the size, the number and the distribution of the connecting holes 11 on the flanges are consistent with those of the connecting holes on the flange surfaces of the feeding throat pipe and the discharging throat pipe.
A method for designing a symmetrical combined spiral ore grinding cylinder comprises the following steps:
firstly, measuring the structural size, the working revolution, the feeding grade distribution, the grinding medium proportion, the filling rate and the ore grinding threshold speed value of the cylinder body 3, and calibrating the recovery coefficient, the dynamic friction coefficient and the static friction coefficient among a grinding medium-lining plate, a grinding medium-grinding medium, a material-lining plate, a material-grinding medium and a material-material;
secondly, simulating the ore grinding process of the cylinder 3 by using a method of combining MATLAB, ADAMS and EDEM;
thirdly, measuring the optimal eccentricity between the axes of the inner cylinder 32 and the outer cylinder 33 of the eccentric cylinder 31, the optimal cross-sectional shape of the inner cylinder of the eccentric cylinder 31, the number of the eccentric cylinders 31 and the optimal spiral axis formed by the axes of the eccentric cylinders 31 along the direction of the rotation axis 7, preferably, determining the optimal eccentricity of the single eccentric cylinder by changing the eccentricity of the single eccentric cylinder 31 and analyzing the statistical results of the relative speed, the tangential friction force and the normal extrusion force between the materials and the grinding media in the single eccentric cylinder and the number of the materials and the grinding media in the cylinder in a low-speed state; determining the optimal cross-sectional shape of the interior of the single eccentric cylinder body by changing the oval interior cross-sectional shape of the interior of the single eccentric cylinder 31 and analyzing the relative speed, tangential friction force and normal extrusion force between the materials and the grinding media in the interior and the statistical rule of the number of the materials and the grinding media in the interior of the cylinder body in a low-speed state; the spiral axis with space symmetry characteristic along the direction of the revolution axis of the combined cylinder body of each single eccentric cylinder body axis forming the combined cylinder body is determined by changing the number of the single eccentric cylinders 31 and the arrangement mode along the direction of the axis, analyzing the relative speed between the materials and the grinding media inside the single eccentric cylinders, the normal extrusion force of the tangential friction force, and the statistical law of the number of the materials and the grinding media in the cylinder body in a low-speed state.
Step five, a verification step: designing a symmetrical combined spiral ore grinding cylinder and a traditional ball mill structural cylinder respectively, and carrying out ore grinding process simulation analysis and experimental analysis respectively by adopting the same technological parameters and working parameters; the rationality of the invention is verified by comparing the relative speed, the tangential friction force and the normal extrusion force between the materials and the grinding media inside the cylinder body and the statistical results of the number of the materials and the grinding media in the low-speed state inside the cylinder body.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.
Claims (7)
1. The utility model provides a symmetry combination formula spiral ore grinding barrel, including barrel (3), respectively with feeding choke (1), ejection of compact choke (6) and drive gear (4) of barrel (3) tip intercommunication, the cover is equipped with frame left branch brace (2) and frame right branch brace (5), its characterized in that respectively on the middle part outer wall of feeding choke (1) and ejection of compact choke (7): the barrel body (3) is formed by butt joint and combination of a plurality of eccentric barrels (31); the eccentric cylinder (31) comprises an inner cylindrical surface (32) and an outer cylindrical surface (33), and an eccentric distance exists between the axis of the inner cylindrical surface (32) and the axis of the outer cylindrical surface (33); the cross section of the outer cylindrical surface (33) of the eccentric cylinders (31) is a circle with equal radius, and the axis of the outer cylindrical surface (33) is a revolution axis (7); the axes of the inner cylindrical surfaces (32) of the eccentric cylinders (31) are uniformly arranged along the circumferential direction at equal angular intervals to form axes which are spirally distributed relative to the rotation axis.
2. A symmetrical combined spiral mill barrel according to claim 1, wherein: the cross section of the inner cylindrical surface (32) is in an elliptical structure, an elliptical polygonal structure or an arc-straight line segment elliptical polygonal structure.
3. A symmetrical combined spiral mill barrel according to claim 2, wherein: and a certain included angle is formed between long axes (34) of cross sections of the inner cylindrical surfaces of the adjacent eccentric cylinders (31).
4. A symmetrical combined spiral mill barrel according to claim 3, wherein: the number of the eccentric cylinders (3) is n, the eccentric cylinders (3) sequentially deflect 360/n degrees in the same direction from left to right, and included angles among long shafts (34) of cross sections of inner cylindrical surfaces of the eccentric cylinders (3) are sequentially deflected in the same direction.
5. A symmetrical combined spiral mill barrel according to claim 4, wherein: the eccentric cylinders (3) are sequentially arranged from left to right, and the left end of the leftmost eccentric cylinder (3) and the right end of the rightmost eccentric cylinder (3) are respectively connected with the right end of the feeding throat pipe (1) and the left end of the discharging throat pipe (6) through flanges.
6. A method for designing a symmetrical combined spiral ore grinding cylinder body of any one of 1-5 is characterized by comprising the following steps:
firstly, measuring the structural size, the working revolution, the feeding grade distribution, the grinding medium proportion, the filling rate and the ore grinding threshold speed value of a cylinder body (3), and calibrating the recovery coefficient, the dynamic friction coefficient and the static friction coefficient among a grinding medium-lining plate, a grinding medium-grinding medium, a material-lining plate, a material-grinding medium and a material-material;
secondly, simulating the ore grinding process of the cylinder (3) by using a method of combining MATLAB, ADAMS and EDEM;
and thirdly, determining the optimal eccentricity between the axis of the inner cylindrical surface (32) and the axis of the outer cylindrical surface (33) of the eccentric cylinders (31), the optimal cross-sectional shape of the inner cylindrical surface of the eccentric cylinders (31), the number of the eccentric cylinders (31) and the optimal axis which is spirally distributed around the revolution axis and is formed by the axes of the inner cylindrical surfaces of the eccentric cylinders (31) along the direction of the revolution axis (7).
7. The design method of the symmetrical combined spiral ore grinding cylinder body as claimed in claim 6, wherein: further comprising a verification step: designing a symmetrical combined spiral ore grinding cylinder and a traditional ball mill structural cylinder respectively, and carrying out ore grinding process simulation analysis and experimental analysis respectively by adopting the same technological parameters and working parameters; the rationality of the cylinder is verified by comparing the relative speed, the tangential friction force and the normal extrusion force between the materials and the grinding media inside the cylinder and the statistical result of the number of the materials and the grinding media in the low-speed state inside the cylinder.
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| CN110842628B (en) * | 2019-12-18 | 2024-06-25 | 中国工程物理研究院机械制造工艺研究所 | Precise rotating device for reducing cylinder |
| TR202102379A2 (en) * | 2021-02-19 | 2021-06-21 | Ilhan Guelbeyaz | SPIRAL GEOMETRIC GRINDING MILL |
| CN114918016B (en) * | 2022-06-09 | 2023-06-02 | 河北地质大学 | Centrifugal magnetic composite force field echelon dry grinding and screening integrated device |
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